Wszystkie pola: Scaphopods - Katalog OPAC zbiorów

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Tytuł:: Faunal dynamics of bivalves and scaphopods in the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland
Autorzy:: Kaim, A.
Sztajner, P.
Powiązania:: https://bibliotekanauki.pl/articles/138633.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
Gnaszyn
iły rudonośne
jura
łódkonogi
małże
paleoekologia
Polska
ślimaki
Bathonian
bivalves
gastropods
Jurassic
ore-bearing clays
palaeoecology
Polska
Scaphopods
Opis:: The environment at the Gnaszyn section - as deduced from bivalve and scaphopod dynamics - was controlled by the substrate consistency and possibly oxygen deficiency near the sediment-water interface and/or oxygen content fluctuations. The middle part of the section dominated by nuculoid and corbulid bivalves and Laevidentalium-type scaphopods probably reflects a soupy substrate and possibly oxygen deficiency in the sediment. Slightly coarser and better-oxygenated silts in the upper and lower parts of the section offered a less soupy substrate consistency, allowing the development of communities dominated by astartids, byssate bivalves, and Dentalium- and Plagioglypta-type scaphopods.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 381-395
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Pinnocaris and the origin of scaphopods
Autorzy:: Peel, J S
Powiązania:: https://bibliotekanauki.pl/articles/21532.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: phylogenesis
Pinnocaris
Scaphopoda
Mollusca
mollusc
Ordovician
Rostroconchia
Helcionelloida
paleontology
Opis:: The description of a tiny coiled protoconch in the Ordovician Pinnocaris lapworthi Etheridge, 1878 indicates that this ribeirioid rostroconch mollusc cannot be the ancestor of scaphopods, resolving recent debate concerning the role of Pinnocaris in scaphopod evolution. The sense of coiling of the scaphopod protoconch is opposite to that of Pinnocaris. Scaphopod protoconchs resemble helcionelloid molluscs (Cambrian–Early Ordovician) in terms of their direction of coiling, although the scaphopod shell is strongly modified by the extreme anterior component of growth. Convergence is identified between scaphopods and two helcionelloid lineages (Eotebenna and Yochelcionella) from the Early–Middle Cambrian. The large stratigraphical gap between helcionelloids and the first undoubted scaphopods (Devonian or Carboniferous) supports the notion that the scaphopods were derived from conocardioid rostroconchs rather than directly from helcionelloids. However, the protoconch of conocardioid rostroconchs closely resembles the helcionelloid shell, suggesting that conocardioids in turn were probably derived from helcionelloids.
Źródło:: Acta Palaeontologica Polonica; 2004, 49, 4
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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